How can I win my ex back? (Gay)

I was with my partner for almost three years when he broke up with me. We had lived together for around two years and still do (separate bedrooms). He broke up with me in March and is now already getting very serious with another guy he started seeing a couple of months later and they have already said ‘I love you’ to each other. It took him way longer to tell me that but I know he really meant it at the time. He was my first love!

The break up was really sudden for me. Although we had come close before I felt like we would always get over anything and could be together for ever. At first it didn’t really sink in and I think I expected us to get back together shortly, I didn’t even want to tell friends! Although I did get upset frequently. My disbelief was helped by the fact that he’d bought me a puppy for Christmas just a few months before so must have thought thinks were OK then. Then one day, shortly after he started seeing this other guy I had a talk with him and asked if he would consider getting back together. He told me bluntly, ‘no’, and I was devastated. He was so sure and by his tone I knew there was nothing I could say to change his mind. When we split up initially he blamed it on the fact I wasn’t willing to have anal sex and he felt like he wasn’t having his needs fulfilled. However this time he said I’d been making him unhappy for months as I was too demanding. He said he couldn’t have it hanging over him if we were to be friends so I resolved to get over it.

Since then his new guy has visited frequently and I actually like him! But at first it killed me to see them together. My ex and I were fighting alot and he got to the stage of asking me to move out (he owns the place and I rent my share). We discussed things and I agreed to be more laid back about silly things I was getting frustrated about. However I do suspect he just wants me out and is looking for any reasons he can find to legitimise it. Anyway, I finally felt like I was getting over him seeing someone else then I discovered they’d said the ‘I love you’s and I feel like thats another stage of upset I have to go through!

I really miss being with this guy. I don’t think I love him just now, but I want us to be back where we were a few months ago, he has changed a lot since then. It kills me that our relationship was so bad for him towards the end and I don’t want him to remember it like that. I like his new guy but can’t stand that a person I loved so much would rather be with him. Is it possible to get my ex back in this situation or is it, as I suspect, too late?